CN112975529B

CN112975529B - Double-spindle machining machine tool and control method thereof

Info

Publication number: CN112975529B
Application number: CN202110301526.3A
Authority: CN
Inventors: 林宗升; 蔡妩平; 王东
Original assignee: Yuhuan Instrument Machine Tool Manufacturing Co ltd
Current assignee: Yuhuan Instrument Machine Tool Manufacturing Co ltd
Priority date: 2021-03-22
Filing date: 2021-03-22
Publication date: 2021-09-14
Anticipated expiration: 2041-03-22
Also published as: CN112975529A

Abstract

The invention belongs to the technical field of processing machines, and particularly relates to a double-spindle processing machine tool and a control method thereof, wherein the double-spindle processing machine tool comprises a machine body, a workbench, spindle assemblies and cutter arrangement assemblies, wherein the workbench, the spindle assemblies and the cutter arrangement assemblies are arranged on the machine body; the processing machine tool also comprises two groups of feeding assemblies arranged on the workbench, and workpieces are respectively conveyed to the workbench and are respectively assembled on the clamping devices on the two main shaft assemblies; and the two groups of blanking assemblies are used for respectively separating the processed workpieces from the clamping devices on the two main shaft assemblies and discharging the workpieces. This machine tool has automatic unloading process of going up to it is stable, the effectual machining efficiency who improves the work piece.

Description

Double-spindle machining machine tool and control method thereof

Technical Field

The invention belongs to the technical field of processing machines, and particularly relates to a double-spindle processing machine tool and a control method thereof.

Background

The processing machine tool is a common processing machine tool, is provided with a multi-dimensional automatic moving track, can automatically complete the processing of a workpiece through input programming, is fixed on a processing table during processing, and completes the processing of the workpiece through automatic shifting of the workpiece and automatic feeding of a cutter, and has higher processing precision because all movements are mechanically and automatically controlled.

The traditional processing machine tool generally adopts a manual mode to carry out feeding one by one, so that the efficiency is low, and the labor cost is increased, so that the machine tool capable of carrying out automatic feeding is available at present, for example, Chinese invention patent application with the publication number of CN104354054A, which discloses a machine tool with an automatic feeding device and an automatic feeding method thereof, and the machine tool can carry out automatic feeding, but has certain defects, for example, the function is single, and workpieces with different models and sizes cannot be automatically fed without adjusting the height of a pushing mould; when the workpiece is loaded, the center of the workpiece cannot be accurately aligned with the clamp, so that the clamp has angular deviation when clamping the workpiece, the clamped workpiece is easily damaged, and the like.

Disclosure of Invention

The invention aims to solve the technical problems and provides a double-spindle processing machine tool and a control method thereof.

The purpose of the invention is realized as follows: the utility model provides a two main shaft machine tool, includes the lathe bed and sets up workstation, main shaft assembly and row's sword subassembly on the lathe bed, the workstation level sets up, arrange the sword subassembly set up in on the workstation, its characterized in that: two groups of spindle assemblies are arranged and are respectively positioned on two sides of the cutter arranging assembly; the processing machine tool also comprises two groups of feeding assemblies arranged on the workbench, and workpieces are respectively conveyed to the workbench and are respectively assembled on the clamping devices on the two main shaft assemblies; and the two groups of blanking assemblies are used for respectively separating the processed workpieces from the clamping devices on the two main shaft assemblies and discharging the workpieces.

The invention is further configured to: the spindle assembly comprises

The seat body is arranged on the bed body;

the first sliding seat is arranged on the seat body in a sliding manner;

the first power device is used for driving the first sliding seat to move on the seat body along the longitudinal direction so that the first sliding seat is close to or far away from the workbench;

the second sliding seat is arranged on the first sliding seat in a sliding manner;

the second power device is used for driving the second sliding seat to move on the seat body along the transverse direction so as to enable the second sliding seat to be close to or far away from the workbench;

the spindle box is arranged on the second sliding seat;

and the clamping device is arranged on the output shaft of the spindle box and used for clamping and driving the workpiece to rotate.

The invention is further configured to: the feeding assembly comprises a receiving seat which is arranged on the workbench, and a receiving groove is formed in the receiving seat;

the feeding device conveys the workpiece into a material receiving groove of the material receiving seat;

and the ejection device ejects the workpiece out of the material receiving groove and sends the workpiece into the clamping device, and the clamping device automatically clamps the workpiece.

The invention is further configured to: the feeding device comprises a feeding bottom plate, two feeding baffles and a feeding cover plate, wherein the feeding bottom plate is arranged obliquely upwards, one lower end of the feeding bottom plate extends to the material receiving groove, the two feeding baffles are respectively arranged on two sides of the feeding bottom plate, a cavity surrounded by the feeding bottom plate and the two feeding baffles forms an input channel for a workpiece to automatically slide to the material receiving groove, and the feeding cover plate covers the upper port of the input channel; the feeding device also comprises a blocking device used for limiting the workpieces to directly slide out of the input channel.

The invention is further configured to: the ejection device comprises a workpiece push plate and a hydraulic driving device for driving the workpiece push plate to reciprocate; the hydraulic driving device comprises a first hydraulic cylinder, an oil groove, a first three-position four-way valve and a working oil pump, wherein an oil inlet port and an oil outlet port are respectively arranged on a rodless cavity and a rod cavity of the first hydraulic cylinder, the first three-position four-way valve is provided with an oil inlet P1, an oil return port T1, a working oil port A1 and a working oil port B1, the oil inlet port of the first hydraulic cylinder is connected with the working oil port A1, the oil outlet port of the first hydraulic cylinder is connected with the working oil port B1, the input end of the working oil pump is connected with the oil groove through an oil pipe, the output end of the working oil pump is connected with the oil inlet P1 through an oil pipe, and the oil return port T1 is connected with the oil groove through an oil pipe;

when the first three-position four-way valve is in the left position, the working oil port A1 is communicated with the oil inlet P1, and the working oil port B1 is communicated with the oil return port T1; when the oil port is positioned at the middle position, all the oil ports are closed; when the hydraulic oil pump is in the right position, the working oil port B1 is communicated with the oil inlet P1, and the working oil port A1 is communicated with the oil return port T1; the end part of a piston rod of the first hydraulic cylinder is arranged on one side surface of the workpiece push plate, the opposite side surface of the workpiece push plate is opposite to the workpiece on the material receiving groove, and the hydraulic driving device further comprises a controller for controlling the first three-position four-way valve and the operating state of the working oil pump so as to control the workpiece push plate to move;

the blocking device comprises a second hydraulic cylinder, a third hydraulic cylinder, a second three-position four-way valve, a first two-position three-way valve and a second two-position three-way valve, the structure of the second three-position four-way valve is the same as that of the first three-position four-way valve, the second hydraulic cylinder and the third hydraulic cylinder are both arranged on the feeding baffle and are close to the first hydraulic cylinder, the second hydraulic cylinder and the third hydraulic cylinder are arranged at a distance of 1-2 workpiece diameters, and through holes for piston rods on the second hydraulic cylinder and the third hydraulic cylinder to extend into are further formed in the feeding baffle; an oil inlet P2 of the second three-position four-way valve is connected with an input port of the working oil pump, an oil return port T2 of the second three-position four-way valve is connected with an oil groove, the working oil port A2 is connected with the oil inlet P3 of the first two-position three-way valve, the working oil port B2 is connected with the oil inlet P4 of the second two-position three-way valve, working oil ports A3 and B3 of the first two-position three-way valve are respectively communicated with ports of rodless cavities on the second hydraulic cylinder and the third hydraulic cylinder, working oil ports A4 and B4 of the second two-position three-way valve are respectively communicated with the ports of the rod cavities on the second hydraulic cylinder and the third hydraulic cylinder, the controller controls the operating states of the working oil pump, the second three-position four-way valve, the first two-position three-way valve and the second two-position three-way valve, the extending amount of the piston rods on the second hydraulic cylinder and the third hydraulic cylinder extending into the input channel is controlled, so that the workpiece in the input channel is allowed or limited to slide outwards.

The invention is further configured to: the hydraulic driving device further comprises a throttling speed regulation device arranged on the oil pipe between the first hydraulic cylinder oil inlet port and the working oil port A, the throttling speed regulation device comprises a throttling valve and an on-off valve, the throttling valve and the on-off valve are connected to the oil pipe between the hydraulic cylinder oil inlet port and the working oil port A in parallel, and the on-off valve is controlled by the controller to be in an on-off state.

The invention is further configured to: the workpiece is of a disc structure and comprises a first ring body, a second ring body and a third ring body which are connected in sequence, and the outer diameter of the second ring body is larger than that of the first ring body and that of the third ring body; the ejection device also comprises a limiting column arranged on the workpiece push plate and a limiting device arranged on the limiting column and used for tightly abutting against the inner wall of the workpiece and aligning the center of the workpiece to the clamping device;

the outer diameter of the limiting column is smaller than the inner diameter of the workpiece, the center of the workpiece in the material receiving groove is lower than the center of the limiting column, and the limiting device comprises a motor, a speed reducer, a first gear, a second gear, a sliding seat and a limiting plate; the limiting post is provided with a mounting groove towards one end of the workpiece, the motor is arranged in the mounting groove, the speed reducer is assembled on the motor, the first gear is arranged on an output shaft of the speed reducer and extends out of the mounting groove, the mounting groove of the limiting post is externally provided with slide rails arranged along the radial direction on the wall, the slide rails are three and are uniformly distributed along the circumferential direction, the slide seats are three and are respectively arranged on the slide rails in a sliding manner, the limiting plates are three and are respectively arranged on the side end parts, away from the first gear, of the slide seats, the side walls of the slide seats are also provided with transmission racks, the transmission racks extend out of the slide seats, the second gears are three and are uniformly distributed along the circumferential direction and are arranged on the wall of the mounting groove of the limiting post in a directional rotating manner, and part of each second gear is meshed with the first gear, the other part is meshed with the transmission rack; when the motor drives the first gear to rotate in a speed reducing mode, the third gear synchronously rotates and enables the three transmission racks and the sliding seat to move outwards or inwards, the outer diameter formed by the three limiting plates is gradually increased or reduced to support or loosen a workpiece, and the motor is controlled by the controller to control the running state of the motor.

The invention is further configured to: the controller comprises a first pressure sensing module, a second pressure sensing module and a PLC control module, wherein the first pressure sensing module is arranged on one side surface of the workpiece push plate close to the workpiece and used for detecting a pressure value between the workpiece push plate and the workpiece, converting the signal and then transmitting the signal to the PLC control module;

the second pressure sensing module is arranged on the limiting plate and used for detecting the pressure value between the limiting plate and the workpiece, converting the signal and then transmitting the signal to the PLC control module;

the third pressure sensing module is arranged at one end, far away from the limiting plate, of one of the transmission racks, and is used for detecting pressure values when the three transmission racks are contacted with each other during retraction, converting the signals and then transmitting the signals to the PLC control module;

the PLC control module is used for controlling the operating states of the working oil pump, the three-position four-way valve, the on-off valve and the motor; the control steps of the controller are as follows:

the PLC control module starts the working oil pump, the second three-position four-way valve is switched to the left position, the first two-position three-way valve is switched left and right, and the second two-position three-way valve is switched left and right, so that after piston rods on the second hydraulic cylinder and the third hydraulic cylinder extend into the input channel, workpieces are manually or sequentially conveyed into the conveying channel by a conveying belt, so that after the piston rod of the third hydraulic cylinder is contacted with the workpieces, the PLC control module switches the second three-position four-way valve to the right position, the first two-position three-way valve is switched to communicate the working oil port A2 with the third hydraulic cylinder, the second two-position three-way valve is switched to communicate the working oil port B2 with the third hydraulic cylinder, the third hydraulic cylinder retracts, and the workpieces slide down to the piston rod of the second hydraulic cylinder; then, a piston rod of the third hydraulic cylinder is controlled to extend out, and a second workpiece in the input channel is blocked; switching a second three-position four-way valve, a first two-position three-way valve and a second two-position three-way valve, controlling a second hydraulic cylinder to retract, enabling a first workpiece in the input channel to slide to the material receiving groove, and then controlling a piston rod of the second hydraulic cylinder to extend;

after the clamping device on the main shaft assembly faces the material receiving seat, the PLC control module switches the first three-position four-way valve to the left position, the on-off valve is opened, pressure oil in the oil groove flows to the oil inlet P1 and the working oil port A1 under the action of the working oil pump, then a small part of the pressure oil flows to the throttle valve, the rest part of the pressure oil flows to the on-off valve and finally enters the first hydraulic cylinder, and a piston rod on the first hydraulic cylinder is pushed to extend outwards, so that a workpiece push plate moves towards a workpiece in the material receiving groove;

after the first pressure sensing module detects the pressure, the PLC control module starts the motor, disconnects the on-off valve and enables the limiting plate to move towards the inner wall of the workpiece, meanwhile, pressure oil entering the first hydraulic cylinder is reduced, and the workpiece push plate slowly pushes the workpiece and moves towards the clamping device on the main shaft assembly;

after the second pressure sensing modules on the limiting plates detect pressure, the PLC control module opens the on-off valve to increase pressure oil entering the first hydraulic cylinder, so that the workpiece push plate quickly pushes the workpiece to move to the clamping device on the main shaft assembly; when the pressure values detected by the second pressure sensing module reach a preset threshold value, controlling the motor to stop rotating;

when the pressure value detected by the first pressure sensing module gradually increases to a preset threshold value, the PLC control module delays the time period t to control the motor to rotate reversely, the first three-position four-way valve is switched to a middle position, the first three-position four-way valve is switched to a right position after the time period t, the limiting plate is separated from the workpiece, the workpiece push plate is far away from the clamping device on the main shaft assembly, and when the third pressure sensing module detects the pressure value, the motor is disconnected; and after the workpiece push plate is reset, the first three-position four-way valve is switched to the middle position, and the working oil pump is closed.

The invention is further configured to: the blanking assembly comprises a blanking bottom plate and blanking baffles, the blanking bottom plate is arranged obliquely downwards, one high end of the blanking bottom plate is positioned below the side of the material receiving seat, two blanking baffles are respectively arranged at two sides of the blanking bottom plate, and a cavity surrounded by the blanking bottom plate and the two blanking baffles forms an output channel for the processed workpiece to automatically slide outwards;

the blanking assembly also comprises a stripper which is arranged above the output channel and used for unloading the workpiece on the clamping device; the stripper comprises a stripping box and a stripping fork plate, a cavity is arranged in the stripping box, a first window, a second window and a third window which are communicated with the cavity are formed in the stripping box, the first window and the second window are respectively positioned on two adjacent side surfaces of the stripping box, the side ends of the first window and the second window are communicated, and the third window is arranged at the bottom of the stripping box and is right opposite to the blanking bottom plate; the stripping fork plate is of a U-shaped structure and is arranged on the second window, and the direction of a port of the stripping fork plate is consistent with that of the first window; the first power device drives the clamping device and the workpiece to move towards the stripping box along the longitudinal direction, and after the workpiece enters the stripping box through the first window, the stripping fork plate is used for limiting the workpiece to be separated from the second window.

The invention also provides a control method for the double-spindle processing machine tool, wherein the control method comprises the following specific steps,

1) workpiece feeding: the workpieces are sequentially placed into the input channel through a manual work or a conveying belt, the workpieces slide to the inclined lower end of the feeding bottom plate gradually under the action of gravity, the workpieces are all blocked by piston rods on a third hydraulic cylinder, then the PLC control module controls the third hydraulic cylinder to retract and extend, in the process, the workpiece at the forefront end moves to a position between a piston rod of the second hydraulic cylinder and a piston rod of the third hydraulic cylinder, then the second hydraulic cylinder is controlled to retract and extend, in the process, the workpiece at the forefront end slides again and falls into a material receiving groove of the material receiving seat, then the third hydraulic cylinder is driven to retract and extend, and after the workpiece is clamped between the piston rods of the second hydraulic cylinder and the third hydraulic cylinder, the second three-position four-way valve is switched to a middle position; meanwhile, under the action of a first power device and a second power device, a main shaft box is opposite to a material receiving seat, a clamping device is aligned to a material receiving groove, then under the control of a PLC control module, a first hydraulic cylinder pushes a workpiece push plate to move towards a workpiece in the material receiving groove, a limiting device clamps the workpiece, then under the action of the first hydraulic cylinder, the workpiece is enabled to lean against and abut against the clamping device, the clamping device clamps the workpiece, then the limiting device releases the workpiece, the first hydraulic cylinder resets, after the resetting is finished, a second hydraulic cylinder retracts, the subsequent workpiece falls into the material receiving groove, and the preparation for processing the next workpiece is made;

2) processing a workpiece: after the first power device and the second power device drive the workpiece on the main shaft box to move transversely and longitudinally and the driving box drives the workpiece to rotate, the workpiece is machined under the action of a cutter on the cutter arranging assembly;

3) unloading the workpiece: after the workpiece is machined, the second power device drives the spindle box to transversely move and enables the workpiece to be aligned to the first window of the stripping box, the first power device drives the spindle box to longitudinally move and gradually move towards the stripping box, after the workpiece passes through the first window and enters the stripping box, the clamping device loosens the workpiece, the second power device drives the spindle box to be away from the stripping box in the transverse direction, the workpiece is separated from the clamping device under the action of the stripping fork plate and falls to the output channel through the third window, then the workpiece flows to the material receiving box through the output channel, after the spindle box longitudinally moves and is separated from the stripping box, the first power device drives the spindle box to longitudinally move again, the spindle box is opposite to the material receiving seat, then the second power device drives the spindle box again, the spindle box is close to the material receiving seat, one-time workpiece machining is completed, and the steps are repeated subsequently.

The invention has the beneficial effects that:

1. set up material loading subassembly and unloading subassembly on the workstation, through automatic carry out material loading, unloading to the work piece, not only reduced the human cost, but also improved the efficiency of material loading, unloading, and then the machining efficiency of the work piece that improves.

2. For the disposable material loading many times, be provided with and be used for carrying out the blocking device that keeps off to the work piece in the input channel, under the effect of second pneumatic cylinder, third pneumatic cylinder, can make the work piece in proper order fall to connect the silo in, it is very convenient.

3. For the limiting device, the workpiece is clamped, more importantly, the center of the workpiece is calibrated, namely, the center of the workpiece is overlapped with the center of the limiting column, the motor is adopted for controlling, the motor drives the first gear to rotate and drives the three second gears to rotate, and the second gear rotates directionally, so that the transmission rack meshed with the second gear moves, namely moves in the radial direction and drives the sliding seat and the limiting plates to move, and the outer diameter formed by the three limiting plates is gradually increased, and then the three limiting plates abut against the inner wall of the workpiece, so that the purpose of abutting against the workpiece is achieved. Because the center of initial stage work piece is less than the center of spacing post, therefore one or these two of three limiting plates contact with the work piece inner wall earlier, remaining limiting block contacts with the work piece inner wall afterwards, certainly, for the calibration work piece center that can be more accurate, to this, can set up one of them slide to slide from top to bottom along vertical direction, two other slides incline 60 slide along vertical direction and set up, can make the slide of top and the last limiting plate contact the work piece inner wall earlier, and jack-up the work piece upwards, after the work piece jack-up, the work piece is under the action of gravity, automatic left right adjustment position, make its center and spacing post center on the coplanar, later remaining two limiting plates simultaneously contradict, support the work piece inner wall tightly, thereby make the center of work piece and the center of spacing post coincide completely.

4. The workpiece is controlled to move forwards in a fast-slow-fast mode, namely, in the period of time that the workpiece push plate is not contacted with the workpiece, in order to improve the efficiency, the workpiece push plate needs to be driven to move in a fast mode; after the workpiece push plate contacts the workpiece, the limiting device needs a certain time to tightly support the workpiece, so that the workpiece is easy to misplace if the workpiece continues to move fast in the period that the workpiece is not fixed, and the workpiece push plate is driven to move in a slow speed mode; after the limiting device supports the workpiece tightly, the workpiece is not easy to loosen, and then the workpiece push plate is driven to move in a quick mode, so that the workpiece ejection efficiency is effectively improved. The preset threshold values of the first pressure sensing module and the second pressure sensing module are used for controlling the pressure between the workpiece and the clamping device, between the limiting plate and the inner wall of the workpiece, and the workpiece is prevented from being damaged due to overlarge pressure.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of the feeding assembly and the discharging assembly of the present invention;

FIG. 3 is an enlarged view at A in FIG. 2;

FIG. 4 is a control connection diagram of the hydraulic drive of the present invention;

FIG. 5 is a block diagram of the connections of the controller of the present invention;

FIG. 6 is a schematic view of a workpiece according to the present invention;

FIG. 7 is a schematic view of the present invention showing the movement of the work push plate toward the workpiece;

FIG. 8 is a schematic view of a workpiece loading configuration according to the present invention;

FIG. 9 is a schematic view of a workpiece loading configuration of the present invention;

the reference numbers in the figures are: 100. a workpiece; 200. a first ring body; 300. a second ring body; 400. a third ring body; 1. a bed body; 2. a work table; 3. a spindle assembly; 31. a base body; 32. a first sliding seat; 33. a first power unit; 34. a second sliding seat; 35. a second power unit; 36. a main spindle box; 37. a clamping device; 4. a gang cutter assembly; 5. a feeding assembly; 51. a receiving seat; 511. a material receiving groove; 512. a top plate; 513. a workpiece baffle; 52. a feeding device; 521. a feeding bottom plate; 522. a feeding baffle plate; 523. a feeding cover plate; 524. a second hydraulic cylinder; 525. a third hydraulic cylinder; 526. a second three-position four-way valve; 527. a first two-position three-way valve; 528. a second two-position three-way valve; 53. an ejection device; 531. pushing a workpiece plate; 532. a first hydraulic cylinder; 533. an oil sump; 534. a first three-position four-way valve; 535. a working oil pump; 536. a controller; 5361. a first pressure sensing module; 5362. a second pressure sensing module; 5363. a third pressure sensing module; 5364. a PLC control module; 5371. a throttle valve; 5372. an on-off valve; 538. a limiting column; 539. a limiting device; 5391. a motor; 5392. a speed reducer; 5393. a first gear; 5394. a second gear; 5395. a slide base; 5396. a limiting plate; 5397. a drive rack; 6. a blanking assembly; 61. a blanking bottom plate; 62. a blanking baffle; 63. a stripper; 631. removing the material box; 6311. a first window; 6312. a second window; 632. a stripping fork plate.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the following description clearly and completely describes the technical solution in the embodiments of the present invention with reference to the accompanying drawings:

a double-spindle machining tool is shown in figures 1, 2 and 3 and comprises a tool body 1, a workbench 2, spindle assemblies 3 and cutter arrangement assemblies 4, wherein the workbench 2, the spindle assemblies 3 and the cutter arrangement assemblies 4 are arranged on the tool body 1, the workbench 2 is horizontally arranged, and the cutter arrangement assemblies 4 are arranged on the workbench 2, wherein the two groups of spindle assemblies 3 are respectively positioned on two sides of the cutter arrangement assemblies 4;

the processing machine tool also comprises two groups of feeding assemblies 5 arranged on the workbench 2, and workpieces are respectively conveyed to the workbench 2 and are respectively assembled on the clamping devices 37 on the two spindle assemblies 3;

and two sets of blanking assemblies 6 for respectively separating the processed workpieces from the clamping devices 37 on the two spindle assemblies 3 and discharging the workpieces. In order to improve the processing efficiency, two groups of spindle assemblies 3 are arranged, and workpieces are processed simultaneously through the two groups of spindle assemblies 3; set up material loading subassembly 5 and unloading subassembly 6 on workstation 2, through automatic carry out material loading, unloading to the work piece, not only reduced the human cost, but also improved the efficiency of material loading, unloading, and then the machining efficiency of the work piece that improves.

The spindle assembly 3 of the present invention comprises

The seat body 31 is arranged on the bed body 1;

the first sliding seat 32 is slidably disposed on the seat body 31;

the first power device 33 is used for driving the first sliding seat 32 to move on the seat body 31 along the longitudinal direction, so that the first sliding seat 32 is close to or far away from the workbench 2;

a second sliding seat 34 slidably disposed on the first sliding seat 32;

the second power device 35 is used for driving the second sliding seat 34 to move on the seat body 31 along the transverse direction, so that the second sliding seat 34 is close to or far away from the workbench 2;

a spindle box 36 provided on the second slide base 34;

and the clamping device 37 is arranged on the output shaft of the main spindle box 36 and is used for clamping and driving the workpiece to rotate.

After the clamping device 37 clamps the workpiece, the first power device 33 drives the spindle box 36 to move longitudinally, the second power device 35 drives the spindle box 36 to move transversely, so that the workpiece approaches to the cutters on the cutter arranging assembly 4, and then the workpiece is machined, the first power device 33 and the second power device 35 are automatically controlled in a numerical control mode, and therefore the workpiece is machined efficiently, the clamping device 37 only needs to be clamped automatically, the technology is mature at present, the gravity center of the invention is not the gravity center, and detailed description is omitted.

As shown in fig. 2 and 3, the feeding assembly 5 of the present invention includes a receiving seat 51 disposed on the worktable 2, and the receiving seat 51 is provided with a receiving slot 511;

a feeding device 52 for conveying the workpiece into a receiving groove 511 of the receiving seat 51;

and an ejector 53 for ejecting the workpiece out of the receiving groove 511 and feeding the workpiece to the clamp device 37, and the clamp device 37 automatically clamps the workpiece.

The feeding device 52 comprises a feeding bottom plate 521, feeding baffles 522 and a feeding cover plate 523, wherein the feeding bottom plate 521 is arranged obliquely upwards, one lower end of the feeding bottom plate 521 extends to the receiving groove 511, the two feeding baffles 522 are arranged at two sides of the feeding bottom plate 521 respectively, a cavity defined by the feeding bottom plate 521 and the two feeding baffles 522 forms an input channel for a workpiece to automatically slide to the receiving groove 511, and the feeding cover plate 523 covers the upper port of the input channel; the loading device 52 also includes a blocking device for limiting the workpiece from sliding directly out of the input channel. After the workpiece is placed at the port of the input channel, the workpiece can automatically slide to the material receiving seat 51 under the action of gravity, so that the automatic material receiving device is very convenient and practical.

As shown in fig. 2, 3 and 4, the ejector 53 of the present invention includes a workpiece push plate 531 and a hydraulic driving device for driving the workpiece push plate 531 to reciprocate; the hydraulic driving device comprises a first hydraulic cylinder 532, an oil groove 533, a first three-position four-way valve 534 and a working oil pump 535, wherein an oil inlet port and an oil outlet port are respectively arranged on a rodless cavity and a rod cavity of the first hydraulic cylinder 532, the first three-position four-way valve 534 is provided with an oil inlet P1, an oil return port T1, a working oil port A1 and a working oil port B1, the oil inlet port of the first hydraulic cylinder 532 is connected with the working oil port A1, the oil outlet port of the first hydraulic cylinder 532 is connected with the working oil port B1, the input end of the working oil pump 535 is connected with the oil groove 533 through an oil pipe, the output end of the working oil pump 535 is connected with an oil inlet P1 through an oil pipe, and the oil return port T1 is connected with the oil groove 533 through an oil pipe;

when the first three-position four-way valve 534 is in the left position, the working oil port A1 is communicated with the oil inlet P1, and the working oil port B1 is communicated with the oil return port T1; when the oil port is positioned at the middle position, all the oil ports are closed; when the oil return valve is in the right position, the working oil port B1 is communicated with the oil inlet P1, and the working oil port A1 is communicated with the oil return port T1; the end of the piston rod of the first hydraulic cylinder 532 is arranged on one side surface of the workpiece push plate 531, the opposite side surface of the workpiece push plate 531 faces the workpiece on the material receiving groove 511, and the hydraulic driving device further comprises a controller 536 for controlling the running state of the first three-position four-way valve 534 and the working oil pump 535 so as to control the movement of the workpiece push plate 531;

the blocking device comprises a second hydraulic cylinder 524, a third hydraulic cylinder 525, a second three-position four-way valve 526, a first two-position three-way valve 527 and a second two-position three-way valve 528, the structure of the second three-position four-way valve 526 is the same as that of the first three-position four-way valve 534, the second hydraulic cylinder 524 and the third hydraulic cylinder 525 are both arranged on the feeding baffle 522 and are close to the first hydraulic cylinder 532, the second hydraulic cylinder 524 and the third hydraulic cylinder 525 are arranged at a distance of 1-2 workpiece diameters, and through holes for piston rods on the second hydraulic cylinder 524 and the third hydraulic cylinder 525 to extend into are further formed in the feeding baffle 522; an oil inlet P2 of the second three-position four-way valve 526 is connected with an input port of a working oil pump 535, the oil return port T2 is connected with the oil groove 533, the working oil port A2 is connected with the oil inlet P3 of the first two-position three-way valve 527, a working oil port B2 of the hydraulic control system is connected with an oil inlet P4 of a second two-position three-way valve 528, working oil ports A3 and B3 of a first two-position three-way valve 527 are respectively communicated with ports of rodless cavities on a second hydraulic cylinder 524 and a third hydraulic cylinder 525, working oil ports A4 and B4 of the second two-position three-way valve 528 are respectively communicated with ports with rod cavities on the second hydraulic cylinder 524 and the third hydraulic cylinder 525, a controller 536 controls the operating states of a working oil pump 535, a second three-position four-way valve 526, a first two-position three-way valve 527 and a second two-position three-way valve 528, so as to control the extending amount of the piston rods of the second hydraulic cylinder 524 and the third hydraulic cylinder 525 extending into the input channel, so as to allow or limit the workpiece in the input channel to slide outwards.

The hydraulic driving device further comprises a throttling speed regulation device arranged on an oil pipe between the oil inlet port of the first hydraulic cylinder 532 and the working oil port A, the throttling speed regulation device comprises a throttling valve 5371 and an on-off valve 5372, the throttling valve 5371 and the on-off valve 5372 are connected in parallel on the oil pipe between the oil inlet port of the hydraulic cylinder and the working oil port A, and the on-off state of the on-off valve 5372 is controlled by the controller 536.

For workpiece ejection, the conventional means is to directly eject the workpiece outwards by using an air cylinder, although the purpose can be achieved, the conventional means is only suitable for processing rough workpieces, for some precise workpieces, the workpiece is easy to move too fast due to the fact that the moving speed of the workpiece cannot be controlled, and further, when the clamping device 37 collides, the workpiece is easy to damage; in addition, when the workpiece is ejected, whether the center of the workpiece is aligned with the clamping device 37 or not cannot be controlled, so that when the clamping device 37 clamps the workpiece, the clamping force acting on the workpiece is uneven due to the inclination of the workpiece, the surface of the workpiece is scratched by a light person, and when the clamping device automatically clamps the workpiece, the center of the workpiece is dislocated, so that the machined workpiece is unqualified. In this regard, the present invention employs a hydraulic method to drive the workpiece push plate 531 to move, and controls the state of the on-off valve 5372 through the controller 536, thereby changing the amount of oil of the pressure oil flowing into the hydraulic cylinder, and further controlling the moving speed of the workpiece push plate 531 to protect the workpiece.

For the purpose of enabling the workpieces to slide down to the receiving groove 511 for one-time multiple feeding, a blocking device for blocking the workpieces in the input channel is further arranged, and the workpieces can sequentially fall into the receiving groove 511 under the action of the second hydraulic cylinder 524 and the third hydraulic cylinder 525, which is very convenient.

The distance between the second hydraulic cylinder 524 and the third hydraulic cylinder 525 is set to be 1.5 times as large as that of a standard component so as to be applicable to workpieces of different sizes.

As shown in fig. 6, the workpiece 100 of the present invention is a disc structure, and includes a first ring 200, a second ring 300, and a third ring 400 connected in sequence, wherein the outer diameter of the second ring 300 is greater than the outer diameters of the first ring 200 and the third ring 400; the ejection device 53 further comprises a limiting column 538 arranged on the workpiece pushing plate 531 and a limiting device 539 arranged on the limiting column 538 and used for abutting against the inner wall of the workpiece and enabling the center of the workpiece to be aligned with the clamping device 37;

as shown in fig. 7, the outer diameter of the limit column 538 is smaller than the inner diameter of the workpiece, the center of the workpiece in the material receiving groove 511 is lower than the center of the limit column 538, and the limit device 539 comprises a motor 5391, a speed reducer 5392, a first gear 5393, a second gear 5394, a sliding base 5395, and a limit plate 5396; the limiting column 538 is provided with a mounting groove towards one end of a workpiece, the motor 5391 is arranged in the mounting groove, the speed reducer 5392 is assembled on the motor 5391, the first gears 5393 are arranged on an output shaft of the speed reducer 5392 and extend out of the mounting groove, three sliding rails arranged in the radial direction are arranged on the outer edge wall of the mounting groove of the limiting column 538, the sliding rails are evenly distributed in the circumferential direction, three sliding seats 5395 are arranged on the sliding rails in a sliding mode respectively, three limiting plates 5396 are arranged on the side end portion, far away from the first gears 5393, of the sliding seat 5395, transmission racks 5397 are further arranged on the side wall of the sliding seat 5395, the transmission racks 5397 extend out of the sliding seat 5395, three second gears 5394 are evenly distributed in the circumferential direction and are arranged on the outer edge wall of the mounting groove 538 in a rotating mode in a directional mode, one portion of each second gear 5394 is meshed with the first gear 5393, and the other portion of each second gear 5397 is meshed with the rack 5397; when the motor 5391 drives the first gear 5393 to rotate at a reduced speed, the three second gears 5394 rotate synchronously, and the three transmission racks 5397 and the sliding base 5395 move outwards or inwards, so that the outer diameter formed by the three limiting plates 5396 is gradually increased or decreased to abut against or loosen a workpiece, and the motor 5391 is controlled by the controller 536 to operate.

Be provided with stop device 539 on work piece push pedal 531, can control circular work piece's center through stop device 539 and aim at clamping device 37 for clamping device 37 can be accurate press from both sides tight work piece, has ensured the machining precision of work piece, and also be suitable for to the work piece of different models size, compare in traditional mode, need not extra adjustment again and connect the position of material seat 51, and is very convenient, and practical. For the limiting device 539, not only the workpiece needs to be clamped, but also the center of the workpiece needs to be calibrated, that is, the center of the workpiece overlaps the center of the limiting post 538, and therefore the motor 5391 is used for controlling the limiting device 539, the motor 5391 drives the first gear 5393 to rotate and drives the three second gears 5394 to rotate, and due to the fact that the second gear 5394 rotates directionally, the transmission rack 5397 meshed with the second gear 5394 moves, that is, moves in the radial direction, and drives the sliding seat 5395 and the limiting plate 5396 to move, so that the outer diameter formed by the three limiting plates 5396 around is gradually increased, and then the outer diameter of the limiting plates is abutted against the inner wall of the workpiece, and the purpose of abutting against the workpiece is achieved. Because the center of the workpiece is lower than the center of the limiting column 538 in the initial stage, one or two of the three limiting plates 5396 are in contact with the inner wall of the workpiece first, and then the remaining limiting blocks are in contact with the inner wall of the workpiece, certainly, the center of the workpiece can be calibrated more accurately, for this purpose, one sliding seat 5395 can be arranged to slide up and down along the vertical direction, and the other two sliding seats 5395 are arranged to slide along the vertical direction by inclining 60 degrees, so that the upper sliding seat 5395 and the upper limiting plate 5396 can be in contact with the inner wall of the workpiece in one step first, and the workpiece can be jacked up upwards.

As shown in fig. 4 and 5, the controller 536 of the present invention includes a first pressure sensing module 5361, which is disposed on a side surface of the workpiece pushing plate 531 close to the workpiece, and is configured to detect a pressure value between the workpiece pushing plate 531 and the workpiece, convert the signal, and send the signal to the PLC control module 5364;

the second pressure sensing module 5362 is arranged on the limiting plate 5396 and used for detecting a pressure value between the limiting plate 5396 and the workpiece, converting the signal and then transmitting the signal to the PLC control module 5364;

the third pressure sensing module 5363 is arranged at one end, far away from the limiting plate 5396, of the transmission rack 5397, and is used for detecting pressure values when the three transmission racks 5397 are contacted with each other during retraction, converting the signals and transmitting the converted signals to the PLC control module 5364;

and a PLC control module 5364 for controlling the operation states of the working oil pump 535, the three-position four-way valve, the on-off valve 5372, and the motor 5391; the control steps of the controller 536 are as follows:

the PLC control module 5364 starts the working oil pump 535, the second three-position four-way valve 526 is switched to the left position, the first two-position three-way valve 527 is switched left and right, and the second two-position three-way valve 528 is switched left and right, so that after piston rods on the second hydraulic cylinder 524 and the third hydraulic cylinder 525 extend into the input channel, workpieces are manually or sequentially conveyed into the conveying channel through a conveying belt, so that after the piston rod of the third hydraulic cylinder 525 contacts the workpieces, the PLC control module 5364 switches the second three-position four-way valve 526 to the right position, the first two-position three-way valve 527 is switched to communicate the working oil port A2 with the third hydraulic cylinder 525, and the second two-position three-way valve 528 is switched to communicate the working oil port B2 with the third hydraulic cylinder 525, so that the third hydraulic cylinder 525 retracts, and the workpieces slide down to the piston rod of the second hydraulic cylinder 524; then the piston rod of the third hydraulic cylinder 525 is controlled to extend out to block a second workpiece in the input channel; switching a second three-position four-way valve 526, a first two-position three-way valve 527 and a second two-position three-way valve 528 to control the second hydraulic cylinder 524 to retract, so that the first workpiece in the input channel slides to the material receiving groove 511, and then controlling the piston rod of the second hydraulic cylinder 524 to extend, repeating the steps, and switching the second three-position four-way valve 526 to the middle position after the workpiece is clamped between the piston rods of the second hydraulic cylinder 524 and the third hydraulic cylinder 525;

after the clamping device 37 on the spindle assembly 3 faces the material receiving seat 51, the PLC control module 5364 switches the first three-position four-way valve 534 to the left position, the on-off valve 5372 is opened, the pressure oil in the oil groove 533 flows to the oil inlet P1 and the working oil port a1 under the action of the working oil pump 535, then a small part of the pressure oil flows to the throttle valve 5371, and the remaining part of the pressure oil flows to the on-off valve 5372 and finally enters the first hydraulic cylinder 532, and pushes the piston rod on the first hydraulic cylinder 532 to extend outwards, so that the workpiece pushing plate 531 moves towards the workpiece in the material receiving groove 511;

after the first pressure sensing module 5361 detects the pressure, the PLC control module 5364 starts the motor 5391, disconnects the on-off valve 5372, and moves the limiting plate 5396 toward the inner wall of the workpiece, while the pressure oil entering the first hydraulic cylinder 532 is reduced, and the workpiece push plate 531 slowly pushes the workpiece and moves toward the clamping device 37 on the spindle assembly 3;

after the second pressure sensing modules 5362 on the limiting plates 5396 detect the pressure, the PLC control module 5364 opens the on-off valve 5372 to increase the pressure oil entering the first hydraulic cylinder 532, so that the workpiece push plate 531 quickly pushes the workpiece to move to the clamping device 37 on the spindle assembly 3; when the pressure values detected by the second pressure sensing module 5362 all reach a preset threshold value, the motor 5391 is controlled to stop rotating;

when the pressure value detected by the first pressure sensing module 5361 gradually increases to a preset threshold value, the PLC control module 5364 delays a time period t to control the motor 5391 to rotate in the reverse direction, and switches the first three-position four-way valve 534 to a neutral position, and switches the first three-position four-way valve 534 to a right position after the time period t to separate the limiting plate 5396 from the workpiece, and the workpiece pushing plate 531 is away from the clamping device 37 on the spindle assembly 3, wherein when the third pressure sensing module 5363 detects the pressure value, the motor 5391 is switched off; after the workpiece push plate 531 is reset, the first three-position four-way valve 534 is switched to the middle position, and the working oil pump 535 is turned off. The above-mentioned t period is a reaction time of the holding device 37, i.e., a time for clamping the workpiece.

In order to avoid collision when the workpiece slides to the receiving groove 511 on the receiving seat 51, the workpiece pushing plate 531 and the limiting device 539 are at a certain distance from the receiving groove 511, that is, after the workpiece slides to the receiving groove 511, the workpiece pushing plate 531 and the workpiece have a certain distance, on the premise that stable ejection of the workpiece is guaranteed, the workpiece gliding and ejection efficiency is improved, the arrangement is adopted, and the control method is adopted to control ejection of the workpiece. The workpiece is controlled to move forwards in a fast-slow-fast mode, namely, in the period of time that the workpiece push plate 531 is not in contact with the workpiece, in order to improve the efficiency, the workpiece push plate 531 needs to be driven to move in a fast mode; after the workpiece push plate 531 contacts the workpiece, the workpiece is abutted by the limiting device 539 within a certain time, so that the workpiece is easily dislocated if the workpiece continues to move fast in the period of time when the workpiece is not fixed, and the workpiece push plate 531 is driven to move in a slow speed mode; after the limiting device 539 tightly supports the workpiece, the workpiece is not easy to loosen, and then the workpiece pushing plate 531 is driven to move in a rapid mode, so that the workpiece ejection efficiency is effectively improved. The preset threshold values of the first pressure sensing module 5361 and the second pressure sensing module 5362 are used for controlling the pressure between the workpiece and the clamping device 37, between the limiting plate 5396 and the inner wall of the workpiece, and damage to the workpiece caused by excessive pressure is avoided.

As shown in fig. 2 and 3, in order to prevent the workpiece from sliding out from the side of the receiving slot 511 close to the clamping device 37 after the workpiece slides into the receiving slot 511 from the input channel, the ejection device 53 of the present invention further includes a limiting part; the limiting part comprises a top plate 512 and a workpiece baffle 513, the top plate 512 is horizontally arranged on the material receiving seat 51 and is positioned above the material receiving groove 511, the workpiece baffle 513 is vertically arranged, the upper end of the workpiece baffle 513 is hinged on the top plate 512, the lower end of the workpiece baffle abuts against the upper end of the third ring body 400, and the side end of the workpiece baffle is opposite to one end, close to the third ring body 400, of the second ring body 300.

The blanking assembly 6 comprises a blanking bottom plate 61 and blanking baffles 62, wherein the blanking bottom plate 61 is arranged obliquely downwards, one high end of the blanking bottom plate is positioned below the material receiving seat 51 side, two blanking baffles 62 are respectively arranged at two sides of the blanking bottom plate 61, and a cavity surrounded by the blanking bottom plate 61 and the two blanking baffles 62 forms an output channel for a processed workpiece to automatically slide outwards;

the blanking assembly 6 further comprises a stripper 63 arranged above the output channel and used for unloading the workpiece on the clamping device 37; the stripper 63 comprises a stripping box 631 and a stripping fork plate 632, the stripping box 631 has a cavity therein, the stripping box 631 is provided with a first window 6311, a second window 6312 and a third window, the first window 6311 and the second window 6312 are respectively located on two adjacent side surfaces of the stripping box 631, and the side ends of the two windows are communicated, the third window is disposed at the bottom of the stripping box 631 and faces the blanking bottom plate 61; the stripping fork plate 632 is of a U-shaped structure and is disposed on the second window 6312, and the direction of the port of the stripping fork plate is consistent with that of the first window 6311; after the first power device 33 drives the clamping device 37 and the workpiece to move towards the stripping box 631 along the longitudinal direction, the stripping fork plate 632 is used for limiting the workpiece to be stripped from the second window 6312 after the workpiece enters the stripping box 631 through the first window 6311.

Through setting up unloading subassembly 6, under the effect of taking off glassware 63, can make the work piece after the processing automatically break away from out clamping device 37 to drop on output channel, it is very convenient and practical, reduced the artifical step of unloading of going, the effectual machining efficiency who improves the work piece.

The invention also provides a control method for the double-spindle processing machine tool, which comprises the following steps,

1) workpiece feeding: the workpieces are sequentially placed into the input channel by manpower or a conveying belt, the workpieces gradually slide towards the inclined lower end of the feeding bottom plate 521 under the action of gravity, as shown in fig. 8, the workpieces are all blocked by piston rods on the third hydraulic cylinder 525, then the PLC control module 5364 controls the third hydraulic cylinder 525 to retract and extend, in the process, as shown in fig. 9, the workpiece at the foremost end moves to a position between a piston rod of the second hydraulic cylinder 524 and a piston rod of the third hydraulic cylinder 525, then the second hydraulic cylinder 524 is controlled to retract and extend, in the process, the workpiece at the foremost end slides again and falls into the material receiving groove 511 of the material receiving seat 51, then the third hydraulic cylinder 525 is driven to retract and extend, and after the workpiece is clamped between the piston rods of the second hydraulic cylinder 524 and the third hydraulic cylinder 525, the second three-position four-way valve 526 is switched to the middle position; meanwhile, under the action of the first power device 33 and the second power device 35, the main spindle box 36 is opposite to the material receiving seat 51, the clamping device 37 is opposite to the material receiving groove 511, then under the control of the PLC control module 5364, the first hydraulic cylinder 532 pushes the workpiece push plate 531 to move towards the workpiece in the material receiving groove 511, the limiting device 539 clamps the workpiece, then under the action of the first hydraulic cylinder 532, the workpiece is close to and abutted against the clamping device 37, the clamping device 37 clamps the workpiece, then the limiting device 539 releases the workpiece, the first hydraulic cylinder 532 is reset, after the reset is finished, the second hydraulic cylinder 524 retracts, the subsequent workpiece falls into the material receiving groove 511, and the next workpiece is ready for processing;

2) processing a workpiece: after the first power device 33 and the second power device 35 drive the workpiece on the main spindle box 36 to move transversely and longitudinally, and the driving box drives the workpiece to rotate, the workpiece is processed under the action of the cutter on the cutter arranging assembly 4;

3) unloading the workpiece: after the workpiece is machined, the second power device 35 drives the spindle box 36 to move transversely and align the workpiece with the first window 6311 of the material removing box 631, the first power device 33 drives the spindle box 36 to move longitudinally and gradually move towards the material removing box 631, after the workpiece passes through the first window 6311 and enters the material removing box 631, the clamping device 37 releases the workpiece, the second power device 35 drives the spindle box 36 to move away from the material removing box 631 along the transverse direction, the workpiece is separated from the clamping device 37 under the action of the material removing fork plate 632 and falls to the output channel through the third window, then the workpiece flows to the material receiving box through the output channel, after the spindle box 36 moves longitudinally and is separated from the material removing box 631, the first power device 33 drives the spindle box 36 to move longitudinally again, so that the spindle box 36 faces the material receiving seat 51, then the second power device 35 drives the spindle box 36 again, so that the spindle box 36 is close to the material receiving seat 51, and one-time of workpiece machining is completed, and subsequently repeating the steps.

The above-mentioned embodiments are only preferred embodiments of the present invention, not all embodiments, and other embodiments obtained by those skilled in the art based on the above-mentioned embodiments should also belong to the protection scope of the present invention without any creative effort, so that: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims

1. The utility model provides a two main shaft machine tool, includes lathe bed (1) and sets up workstation (2), main shaft subassembly (3) and row's sword subassembly (4) on lathe bed (1), workstation (2) level sets up, arrange sword subassembly (4) set up in on workstation (2), its characterized in that: two groups of spindle assemblies (3) are arranged and are respectively positioned at two sides of the cutter arranging assembly (4);

the processing machine tool also comprises two groups of feeding assemblies (5) arranged on the workbench (2), and the workpieces are respectively conveyed to the workbench (2) and are respectively assembled on clamping devices (37) on the two main shaft assemblies (3);

the two groups of blanking assemblies (6) respectively separate the processed workpieces from the clamping devices (37) on the two main shaft assemblies (3) and unload the workpieces;

the spindle assembly (3) comprises

The seat body (31) is arranged on the lathe bed (1);

the first sliding seat (32) is arranged on the seat body (31) in a sliding manner;

the first power device (33) is used for driving the first sliding seat (32) to move on the seat body (31) along the longitudinal direction so that the first sliding seat (32) is close to or far away from the workbench (2);

the second sliding seat (34) is arranged on the first sliding seat (32) in a sliding manner;

the second power device (35) is used for driving the second sliding seat (34) to move on the seat body (31) along the transverse direction, so that the second sliding seat (34) is close to or far away from the workbench (2);

a spindle box (36) arranged on the second sliding seat (34);

the clamping device (37) is arranged on an output shaft of the main shaft box (36) and is used for clamping and driving a workpiece to rotate;

the feeding assembly (5) comprises

The receiving seat (51) is arranged on the workbench (2), and a receiving groove (511) is formed in the receiving seat (51);

the feeding device (52) is used for conveying the workpiece into the material receiving groove (511) of the material receiving seat (51);

the ejection device (53) ejects the workpiece out of the material receiving groove (511) and sends the workpiece to the clamping device (37), and the clamping device (37) automatically clamps the workpiece;

the feeding device (52) comprises a feeding bottom plate (521), feeding baffle plates (522) and a feeding cover plate (523), wherein the feeding bottom plate (521) is arranged obliquely upwards, one lower end of the feeding bottom plate extends to the material receiving groove (511), the two feeding baffle plates (522) are arranged on two sides of the feeding bottom plate (521) respectively, a cavity defined by the feeding bottom plate (521) and the two feeding baffle plates (522) forms an input channel for a workpiece to automatically slide to the material receiving groove (511), and the feeding cover plate (523) covers an upper port of the input channel; the feeding device (52) also comprises a blocking device used for limiting the workpieces to directly slide out of the input channel;

the ejection device (53) comprises a workpiece push plate (531) and a hydraulic driving device for driving the workpiece push plate (531) to reciprocate;

the hydraulic driving device comprises a first hydraulic cylinder (532), an oil groove (533), a first three-position four-way valve (534) and a working oil pump (535), wherein an oil inlet port and an oil outlet port are respectively arranged on a rodless cavity and a rod cavity of the first hydraulic cylinder (532), the first three-position four-way valve (534) is provided with an oil inlet P1, an oil return port T1, a working oil port A1 and a working oil port B1, the oil inlet port of the first hydraulic cylinder (532) is connected with the working oil port A1, the oil outlet port of the first hydraulic cylinder is connected with the working oil port B1, the input end of the working oil pump (535) is connected with the oil groove (533) through an oil pipe, the output end of the working oil pump is connected with the oil inlet P1 through an oil pipe, and the oil return port T1 is connected with the oil groove (533) through an oil pipe;

when the first three-position four-way valve (534) is in the left position, the working oil port A1 is communicated with the oil inlet P1, and the working oil port B1 is communicated with the oil return port T1; when the oil port is positioned at the middle position, all the oil ports are closed; when the hydraulic oil pump is in the right position, the working oil port B1 is communicated with the oil inlet P1, and the working oil port A1 is communicated with the oil return port T1; the end part of a piston rod of the first hydraulic cylinder (532) is arranged on one side surface of the workpiece push plate (531), the opposite side surface of the workpiece push plate (531) faces to the workpiece on the material receiving groove (511), and the hydraulic driving device further comprises a controller (536) for controlling the running states of the first three-position four-way valve (534) and the working oil pump (535) so as to control the workpiece push plate (531) to move;

the blocking device comprises a second hydraulic cylinder (524), a third hydraulic cylinder (525), a second three-position four-way valve (526), a first two-position three-way valve (527) and a second two-position three-way valve (528), the structure of the second three-position four-way valve (526) is the same as that of a first three-position four-way valve (534), the second hydraulic cylinder (524) and the third hydraulic cylinder (525) are both arranged on the feeding baffle (522) and are close to the first hydraulic cylinder (532), and the second hydraulic cylinder (524) and the third hydraulic cylinder (525) are arranged at a distance of 1-2 workpiece diameters;

the feeding baffle (522) is also provided with through holes for piston rods on the second hydraulic cylinder (524) and the third hydraulic cylinder (525) to extend into respectively; an oil inlet P2 of the second three-position four-way valve (526) is connected with an input port of a working oil pump (535), an oil return port T2 of the second three-position four-way valve is connected with an oil groove (533), a working oil port A2 of the second three-position four-way valve is connected with an oil inlet P3 of the first two-position three-way valve (527), a working oil port B2 of the second two-position three-way valve (527) is connected with an oil inlet P4 of the second two-position three-way valve (528), working oil ports A3 and B3 of the first two-position three-way valve (527) are respectively communicated with ports of rodless cavities on the second hydraulic cylinder (524) and the third hydraulic cylinder (525), and working oil ports A4 and B4 of the second two-position three-way valve (528) are respectively communicated with ports of rod cavities on the second hydraulic cylinder (524) and the third hydraulic cylinder (525);

the controller (536) controls the operating states of the working oil pump (535), the second three-position four-way valve (526), the first two-position three-way valve (527) and the second two-position three-way valve (528) to control the extending amount of the piston rods on the second hydraulic cylinder (524) and the third hydraulic cylinder (525) extending into the input channel, so that a workpiece in the input channel is allowed or limited to slide out outwards.

2. A double spindle machine tool according to claim 1, wherein: the hydraulic driving device further comprises a throttling speed regulation device arranged on an oil pipe between the oil inlet port of the first hydraulic cylinder (532) and the working oil port A, the throttling speed regulation device comprises a throttling valve (5371) and an on-off valve (5372), the throttling valve (5371) and the on-off valve (5372) are connected in parallel on the oil pipe between the oil inlet port of the hydraulic cylinder and the working oil port A, and the on-off valve (5372) is controlled by the controller (536) to control the on-off state of the on-off valve.

3. A double spindle machine tool according to claim 2, wherein: the workpiece is of a disc structure and comprises a first ring body (200), a second ring body (300) and a third ring body (400) which are sequentially connected, and the outer diameter of the second ring body (300) is larger than that of the first ring body (200) and that of the third ring body (400); the ejection device (53) further comprises a limiting column (538) arranged on the workpiece push plate (531) and a limiting device (539) arranged on the limiting column (538) and used for tightly abutting against the inner wall of a workpiece and enabling the center of the workpiece to be aligned with the clamping device (37);

the outer diameter of the limiting column (538) is smaller than the inner diameter of a workpiece, the center of the workpiece in the material receiving groove (511) is lower than that of the limiting column (538), and the limiting device (539) comprises a motor (5391), a speed reducer (5392), a first gear (5393), a second gear (5394), a sliding seat (5395) and a limiting plate (5396); the end, facing the workpiece, of the limiting column (538) is provided with a mounting groove, the motor (5391) is arranged in the mounting groove, the reducer (5392) is assembled on the motor (5391), the first gear (5393) is arranged on an output shaft of the reducer (5392) and extends out of the mounting groove, the outer edge wall of the mounting groove of the limiting column (538) is provided with three sliding rails arranged in the radial direction, the three sliding rails are uniformly distributed in the circumferential direction, the three sliding seats (5395) are respectively arranged on the sliding rails in a sliding manner, the three limiting plates (5396) are respectively arranged on the side end, away from the first gear (5393), of the sliding seat (5395), the side wall of the sliding seat (5395) is further provided with a transmission rack (5397), the transmission racks (5397) extend out of the sliding seat (5395), the three second gears (5394) are uniformly distributed in the circumferential direction, the second gears (5394) are arranged on the outer edge wall of the mounting groove of the limiting column (538) in a directional and rotating mode, one part of each second gear is meshed with the first gear (5393), and the other part of each second gear is meshed with the transmission rack (5397); when the motor (5391) drives the first gear (5393) to rotate in a decelerating manner, the three second gears (5394) synchronously rotate, the three transmission racks (5397) and the sliding base (5395) move outwards or inwards, the outer diameter formed by the three limiting plates (5396) is gradually increased or reduced to abut against or loosen a workpiece, and the running state of the motor (5391) is controlled by the controller (536).

4. A double spindle machine tool according to claim 3, wherein: the controller (536) comprises a first pressure sensing module (5361), which is arranged on one side surface of the workpiece push plate (531) close to the workpiece, and is used for detecting the pressure value between the workpiece push plate (531) and the workpiece, converting the signal and then transmitting the signal to the PLC control module (5364);

the second pressure sensing module (5362) is arranged on the limiting plate (5396) and used for detecting the pressure value between the limiting plate (5396) and the workpiece, converting the signal and then transmitting the signal to the PLC control module (5364);

the third pressure sensing module (5363) is arranged at one end, far away from the limiting plate (5396), of one of the transmission racks (5397), and is used for detecting pressure values when the three transmission racks (5397) are contacted with each other during retraction, converting the signals and then transmitting the signals to the PLC control module (5364);

and a PLC control module (5364) for controlling the operating states of the working oil pump (535), the three-position four-way valve, the on-off valve (5372) and the motor (5391); the control steps of the controller (536) are as follows:

the PLC control module (5364) starts the working oil pump (535), the second three-position four-way valve (526) is switched to the left position, the first two-position three-way valve (527) is switched left and right, and the second two-position three-way valve (528) is switched left and right to ensure that piston rods on the second hydraulic cylinder (524) and the third hydraulic cylinder (525) extend into the input channel, the workpieces are sent into the conveying channel manually or by a conveying belt in sequence, after the piston rod of the third hydraulic cylinder (525) is contacted with the workpieces, the PLC control module (5364) switches the second three-position four-way valve (526) to the right position, the first two-position three-way valve (527) is switched to communicate the working oil port A2 with the third hydraulic cylinder (525), and the second two-position three-way valve (528) is switched to communicate the working oil port B2 with the third hydraulic cylinder (525), so that the third hydraulic cylinder (525) retracts, and the workpiece slides downwards to the piston rod of the second hydraulic cylinder (524); then, a piston rod of a third hydraulic cylinder (525) is controlled to extend out to block a second workpiece in the input channel; switching a second three-position four-way valve (526), a first two-position three-way valve (527) and a second two-position three-way valve (528), controlling a second hydraulic cylinder (524) to retract, enabling a first workpiece in the input channel to slide to a material receiving groove (511), and then controlling a piston rod of the second hydraulic cylinder (524) to extend out;

after a clamping device (37) on the main shaft assembly (3) faces a material receiving seat (51), a PLC control module (5364) switches a first three-position four-way valve (534) to the left position, an on-off valve (5372) is opened, pressure oil in an oil groove (533) flows to an oil inlet P1 and a working oil port A1 under the action of a working oil pump (535), then a small part of the pressure oil flows to a throttle valve (5371), the rest part of the pressure oil flows to the on-off valve (5372), finally enters a first hydraulic cylinder (532), and pushes a piston rod on the first hydraulic cylinder (532) to extend outwards, so that a workpiece push plate (531) moves towards a workpiece in a material receiving groove (511);

after the first pressure sensing module (5361) detects pressure, the PLC control module (5364) starts the motor (5391), the on-off valve (5372) is switched off, the limiting plate (5396) moves towards the inner wall of the workpiece, meanwhile pressure oil entering the first hydraulic cylinder (532) is reduced, and the workpiece push plate (531) slowly pushes the workpiece and moves towards the clamping device (37) on the spindle assembly (3);

after the second pressure sensing modules (5362) on the limiting plates (5396) detect the pressure, the PLC control module (5364) opens the on-off valve (5372) to increase pressure oil entering the first hydraulic cylinder (532), so that the workpiece push plate (531) quickly pushes the workpiece to move towards the clamping device (37) on the spindle assembly (3); when the pressure values detected by the second pressure sensing module (5362) all reach a preset threshold value, controlling the motor (5391) to stop rotating;

when the pressure value detected by the first pressure sensing module (5361) is gradually increased to a preset threshold value, the PLC control module (5364) delays a t time period to control the motor (5391) to rotate reversely, the first three-position four-way valve (534) is switched to a middle position, the first three-position four-way valve (534) is switched to a right position after the t time period, the limiting plate (5396) is made to be separated from a workpiece, the workpiece push plate (531) is far away from a clamping device (37) on the spindle assembly (3), and when the third pressure sensing module (5363) detects the pressure value, the motor (5391) is switched off; after the workpiece push plate (531) is reset, the first three-position four-way valve (534) is switched to a middle position, and the working oil pump (535) is closed.

5. A double spindle machine tool according to claim 4, wherein: the blanking assembly (6) comprises a blanking bottom plate (61) and blanking baffles (62), the blanking bottom plate (61) is arranged obliquely downwards, one high end of the blanking bottom plate is positioned below the side of the receiving seat (51), two blanking baffles (62) are arranged on two sides of the blanking bottom plate (61) respectively, and a cavity defined by the blanking bottom plate (61) and the two blanking baffles (62) forms an output channel for the processed workpiece to automatically slide outwards;

the blanking assembly (6) further comprises a stripper (63) which is arranged above the output channel and used for unloading the workpiece on the clamping device (37); the stripper (63) comprises a stripping box (631) and a stripping fork plate (632), a cavity is arranged in the stripping box (631), a first window (6311), a second window (6312) and a third window which are communicated with the cavity are formed in the stripping box (631), the first window (6311) and the second window (6312) are respectively located on two adjacent side faces of the stripping box (631), the two side ends of the two side faces are communicated, and the third window is arranged at the bottom of the stripping box (631) and is right opposite to the blanking bottom plate (61); the stripping fork plate (632) is of a U-shaped structure and is arranged on the second window (6312), and the direction of the port of the stripping fork plate is consistent with that of the first window (6311); the first power device (33) drives the clamping device (37) and the workpiece to move towards the stripping box (631) along the longitudinal direction, and after the workpiece enters the stripping box (631) through the first window (6311), the stripping fork plate (632) is used for limiting the workpiece to be separated from the second window (6312).

6. A control method for the double spindle machine tool of claim 5, characterized in that: the control method comprises the following specific steps of,

workpiece feeding: workpieces are sequentially placed into an input channel through manual work or a conveying belt, the workpieces gradually slide towards the inclined lower end of a feeding bottom plate (521) under the action of gravity, so that the workpieces are blocked by piston rods on a third hydraulic cylinder (525), then a PLC (programmable logic controller) control module (5364) controls the third hydraulic cylinder (525) to retract and extend out, in the process, the workpiece at the forefront end moves to a position between a piston rod of the second hydraulic cylinder (524) and a piston rod of the third hydraulic cylinder (525), then the second hydraulic cylinder (524) is controlled to retract and extend out, in the process, the workpiece at the forefront end slides again and falls into a material receiving groove (511) of a material receiving seat (51), then the third hydraulic cylinder (525) is driven to retract and extend out, and after the workpieces are clamped between the piston rods of the second hydraulic cylinder (524) and the third hydraulic cylinder (525), the second three-position four-way valve (526) is switched to a middle position; meanwhile, under the action of a first power device (33) and a second power device (35), a main shaft box (36) is opposite to a material receiving seat (51), a clamping device (37) is aligned to a material receiving groove (511), then under the control of a PLC (programmable logic controller) control module (5364), a first hydraulic cylinder (532) pushes a workpiece push plate (531) to move towards a workpiece in the material receiving groove (511), a limiting device (539) clamps the workpiece, then under the action of the first hydraulic cylinder (532), the workpiece is abutted against and tightly pressed on the clamping device (37), the clamping device (37) clamps the workpiece, then the limiting device (539) releases the workpiece, the first hydraulic cylinder (532) resets, after the resetting is finished, a second hydraulic cylinder (524) retracts, a subsequent workpiece falls into the material receiving groove (511), and the next workpiece is ready for processing;

2) processing a workpiece: after the first power device (33) and the second power device (35) drive the workpiece on the main shaft box (36) to move transversely and longitudinally and the driving box drives the workpiece to rotate, the workpiece is machined under the action of the cutter on the cutter arranging assembly (4);

3) unloading the workpiece: after the workpiece is processed, the second power device (35) drives the spindle box (36) to transversely move and enable the workpiece to be aligned to the first window (6311) of the stripping box (631), the first power device (33) drives the spindle box (36) to longitudinally move and gradually move towards the stripping box (631), after the workpiece passes through the first window (6311) and enters the stripping box (631), the clamping device (37) releases the workpiece, the second power device (35) drives the spindle box (36) to be far away from the stripping box (631) along the transverse direction, the workpiece is separated from the clamping device (37) under the action of the stripping fork plate (632) and falls to the output channel through the third window, then the workpiece flows to the material receiving box through the output channel, after the spindle box (36) longitudinally moves and is separated from the stripping box (631), the first power device (33) drives the spindle box (36) to longitudinally move again, and enables the spindle box (36) to face to the material receiving seat (51), and then the second power device (35) drives the main shaft box (36) again to enable the main shaft box (36) to be close to the material receiving seat (51), so that one-time workpiece processing is completed, and the steps are repeated subsequently.